Restore Peak Performance to Your 2004 GM Vehicle
Is your 2004 GMC Savana 2500, or another compatible GM truck or van, suffering from mysterious and frustrating engine issues? The Engine Control Module (ECM), often called the Powertrain Control Module (PCM), is the central computer responsible for managing everything from fuel mixture and ignition timing to transmission shifts and emissions controls. When it begins to fail, it can cause a cascade of problems that can be difficult to diagnose. This direct-fit replacement ECM, part number 89017739, is the definitive solution to get your vehicle back on the road and running reliably.
From the Diagnostic Bay
We recently had a 2004 Express work van towed in with an intermittent no-start condition. The owner had already replaced the battery and checked the fuel pump. Our diagnostic scan tool couldn’t communicate with the engine computer. After a visual inspection, we found the ECM, located in the LH rear of the engine bay, had signs of corrosion on the connectors from years of exposure. A failing computer was the culprit. By installing a pre-programmed 2004 Savana 2500 ECM like this one, we had the van starting reliably and back to work for the customer the very same day, saving them from a costly trip to the dealership.
Common Symptoms of a Failing ECM
If you’re experiencing any of the following issues, a faulty engine computer could be the root cause. Don’t let a bad module leave you stranded or cause further damage to your vehicle’s systems.
- ✔ Persistent Check Engine Light (CEL) with codes such as P0601, P0602, P0606, or other internal processor faults.
- ✔ Engine cranks but refuses to start, or starts and immediately stalls.
- ✔ Noticeable decrease in fuel economy and poor engine performance.
- ✔ Rough or erratic idling and hesitation during acceleration.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Unexplained stalling for no apparent reason.
- ✔ Loss of communication with the module when using a diagnostic scan tool.
The Simple, Reliable Solution: Your 2004 Savana 2500 Engine Module
Don’t settle for a junkyard part with an unknown history or pay exorbitant dealership prices for programming. This module is a complete, ready-to-install solution. We take a high-quality, tested ECM and flash it with the latest official GM software updates specifically for your vehicle. All you need to do is provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN) during checkout. This ensures that the module that arrives at your door is perfectly matched to your vehicle’s original factory specifications, including engine, transmission, and emissions equipment. This process eliminates the need for any additional programming, making the installation process as straightforward as possible.
This versatile module is compatible with a wide array of 2004 GM vehicles, including the Chevrolet Express, GMC Savana, Chevrolet Silverado, GMC Sierra, Chevrolet Trailblazer, GMC Envoy, and many more. It is a direct replacement for part numbers 89017739 and 12586243.
Frequently Asked Questions
Is this ECM difficult to install?
The physical installation is straightforward for most DIY mechanics. It typically involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. However, after installation, you will need to perform a security relearn procedure (also known as a CASE relearn or Passlock relearn) so the module can communicate with your vehicle’s anti-theft system. This procedure can be done without special tools and instructions are readily available online.
How do I provide my VIN for programming?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add this as a note during checkout or send it to us in a message referencing your order number. We cannot ship your part until we receive the VIN.
Where is the ECM located on my 2004 Savana 2500?
On the 2004 GMC Savana and Chevrolet Express vans, the ECM is located in the engine compartment on the driver’s side, towards the rear of the engine bay.
Will this part fix my check engine light?
If your check engine light is on due to an internal failure of the original ECM (common codes P0601-P0606), then this replacement module will solve the problem. If the light is on for other reasons, such as a faulty sensor, you will still need to diagnose and repair that separate issue.
What part numbers does this module replace?
This module is a direct replacement for GM part numbers 89017739 and 12586243, ensuring proper function and fitment across a wide range of vehicles.